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How to open .CRL files on Android

To open .CRL files on Android, android commonly lacks built-in CRL inspection tools; if it won’t open, move the file to a desktop and view it with OpenSSL or Windows’ certificate tools.

Step-by-step instructions

  1. Android commonly lacks built-in CRL inspection tools; if it won’t open, move the file to a desktop and view it with OpenSSL or Windows’ certificate tools.

Alternative methods

  • Open .CRL in a browser-based viewer if desktop apps fail.
  • Try opening .CRL on Android with a secondary app to rule out app-specific issues.
  • Convert .CRL only with trusted tools when direct opening is not possible.

Common issues

OpenSSL says it cannot read the CRL (PEM/DER mismatch)

CRLs are commonly stored as either DER (binary) or PEM (Base64). If the tool assumes the wrong encoding, it may fail to parse the file.

  1. Try OpenSSL with an explicit input format: openssl crl -inform DER -in file.crl -noout -text
  2. If it’s PEM, ensure the file contains a PEM header/footer (often begins with '-----BEGIN X509 CRL-----') and rerun without -inform DER

Windows import/view fails or shows unexpected results

The CRL may be corrupted/incomplete, or you may be importing it into the wrong store/context (for example, expecting it to apply to a different CA).

  1. Re-download the .crl from its official distribution source (for example, the CA’s published CRL URL) and try again.
  2. Confirm the CRL issuer matches the CA you expect by inspecting it (e.g., with OpenSSL text output) before importing.

The CRL appears “expired” or not yet valid

CRLs include update timing fields; if the system clock is wrong, or the CRL is older than expected, validation tooling may treat it as stale.

  1. Check your device date/time settings and correct them if necessary.
  2. Obtain the latest base/delta CRL from the official CA distribution location and re-check.

Security note

A CRL is signed PKI data; treat it as untrusted input until parsed by reputable tooling—malformed ASN.1/DER data can trigger vulnerabilities in buggy parsers.

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